<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/vue"></script>
<script src="https://unpkg.com/vuex"></script>
</head>
<body>
  <div id="app">
      <h1>{{header}}</h1>
      <h2>{{welcome}}</h2>
      <h3>{{counter}}</h3>
      <button @click="increment">Press Me</button>
  </div>
